Kartesz, J.T.
1994.
A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. Vol. I. Checklist. Biota of North America. Univ. Timber Press, Portland, OR. 622pp.

Kartesz, J.T., and C.A. Meacham.
1999.
Digital Floristic Synthesis of North America North of Mexico. Published for the Biota. of North America Program of the North Carolina Botanical Garden, by Patricia Ledlie Bookseller, Inc. Buckfield, ME. (in press)